Market evolution: Nuclear reactors and parts (CN 8401) — 2015–2025

Introduction

This report examines the evolution of EU external trade in products covered by Combined Nomenclature heading 8401, which encompasses nuclear reactors, non-irradiated fuel elements and cartridges, machinery and apparatus for isotopic separation, and their parts. Over the 2015–2025 period, the EU's trade in this strategically sensitive sector underwent a profound transformation. The Union moved from a sizeable trade deficit to a surplus position, driven by a sharp expansion in domestic production, rising unit values, and a significant reshaping of its network of trade partners. Three dynamics stand out: a structural shift toward greater industrial self-sufficiency, a geopolitical realignment of import sources and export destinations, and a market increasingly concentrated in fuel-cartridge trade with notable episodes of price volatility.

1. From Deficit to Surplus: The EU's Nuclear Industrial Expansion

The trade balance reversed over the decade

The EU entered the period as a net importer of CN 8401 products, recording a trade deficit of €247 million in 2015. By 2025, the balance had swung to a surplus of approximately €30 million. The reversal was not linear: the deficit narrowed through the late 2010s, briefly turned into a small surplus around 2019–2020, and consolidated in positive territory by the end of the period. Export values grew by 156.3% (from €310 million to €794 million), far outpacing the 37.1% rise in import values (from €557 million to €764 million). Notably, neither export nor import volumes kept pace with value growth — export quantities actually fell by 7.4% and import quantities by 7.6% — signalling that the value expansion was primarily price-driven.

Domestic production scaled up dramatically

EU production of CN 8401 goods grew enormously over the period, with production value rising from approximately €309 million to €1,224 million (+296.4%). Production volumes in physical terms expanded even more steeply. This expansion underpinned the EU's improved trade balance and indicates a significant build-up of manufacturing capacity, most likely in the fuel-cartridge segment (CN 840130), which dominates the heading. The increase in domestic supply capacity reduced the economy's reliance on external sources.

Trade intensity and export propensity declined sharply

Paradoxically, even as trade values grew, the EU's trade intensity — the ratio of trade flows to domestic production — fell from 61.4% to 22.1% (−64.0%). Similarly, export propensity dropped from 54.0% to 18.4% (−66.0%). Both metrics scored extremely high on the salience index (97.6 and 91.9 respectively), confirming the significance of the shift. This pattern is consistent with a growing share of production being absorbed domestically — likely reflecting fleet-renewal programmes, life-extension projects, and renewed policy emphasis on nuclear energy across several EU member states. The net import reliance improved from −53.7% to −15.7% (+70.8%), indicating that while the EU remained a net exporter throughout most of the period, its external exposure relative to domestic production narrowed considerably.

2. Reshaping the Map: Diversification and Geopolitical Shifts

Russia remained the dominant import source but its share eroded

Russia was by far the EU's largest import partner throughout the period, supplying €414 million in 2015 and €469 million in 2025 (+13.3%). However, Russia's share of total CN 8401 imports fell from roughly 74% to 62%, as other suppliers gained ground. This is especially significant in the context of broader EU efforts to reduce strategic dependence on Russian energy-related goods following 2022. The import concentration index (HHI) for value declined from 6,263 to 4,984 (−20.4%), confirming a gradual diversification of supply — though the level remains well above the 2,500 threshold typically considered "highly concentrated."

Brexit reclassified the UK into the extra-EU partner set

One of the most striking changes in the import data is the rise of the United Kingdom, which went from €440 thousand in 2015 to €83 million in 2025 (a reported increase of 18,723.7%). Part of this leap reflects the statistical reclassification of UK–EU trade from intra-EU to extra-EU flows after Brexit (effective January 2021), rather than a purely organic trade expansion. The UK's peak year recorded €156 million in imports. On the export side, the UK was already a significant destination in 2015 (€78 million) and grew to €134 million (+73.0%), making it the EU's second-largest non-EU export market by 2025.

Export destinations shifted toward Asia and Africa

The EU's export geography diversified substantially, with the export HHI falling from 2,442 to 1,648 (−32.5%), moving from moderate concentration into the unconcentrated range. Several partners saw dramatic growth:

The surge in exports to China mirrors the country's aggressive nuclear construction programme. Ukraine's growth likely reflects both civilian nuclear cooperation and, post-2022, strategic support to help Ukraine reduce its own Russian dependencies. South Africa's trajectory suggests involvement in the country's planned fleet of new reactors. Meanwhile, exports to the United States — the largest single destination — remained broadly flat at around €116 million.

EU member-state specialisation reveals a two-speed landscape

Looking at revealed comparative advantage, Sweden (RSCA: 0.88, RCA: 15.6) and Spain (RSCA: 0.71, RCA: 5.9) stand out as the most specialised EU exporters in CN 8401, with nuclear-related products representing a disproportionately large share of their total exports. Germany holds the largest absolute share of EU production in this sector (21.8%) but with a more modest specialisation index (RSCA: 0.01). At the other end, Finland, Belgium, and Greece show virtually no specialisation, reflecting their limited involvement in nuclear fuel-cycle manufacturing.

Among importing member states, France saw the most dramatic growth (+364.6%, from €42 million to €196 million), consistent with its policy of nuclear fleet renewal. Hungary (+94.6% to €173 million) and Slovakia (+95.9% to €158 million) also increased imports significantly, reflecting ongoing reactor construction and fuel-supply contracts in Central Europe.

3. Prices, Volatility, and a Fuel-Cartridge-Dominated Market

Fuel cartridges account for the overwhelming majority of trade

The CN 8401 heading bundles several very different product lines, but trade is heavily concentrated in fuel elements and cartridges (CN 840130). In 2025, fuel cartridges represented approximately 88% of import value (€675 million out of €764 million) and 69% of export value (€545 million out of €794 million). The second-largest segment, parts of nuclear reactors (CN 840140), accounted for 12% of imports and 24% of exports. Isotopic separation machinery (CN 840120) and complete nuclear reactors (CN 840110) represent very small shares.

Unit values surged, more so on the export side

Across the heading, export unit values rose by 176.7% (from €140,309/t to €388,274/t), while import prices increased by 48.3% (from €563,445/t to €835,842/t). The historically higher import price reflects the premium placed on fuel assemblies sourced from Russia (which processes and enriches uranium for EU reactors at scale). By 2025, however, fuel-cartridge export prices (€1,345,316/t) actually exceeded import prices (€1,298,602/t), suggesting a shift toward exporting higher-specification products. The isotopic separation segment shows an even starker differential: EU exports in this niche averaged €66,200/t compared to just €14,671/t for imports, indicating that the EU specialises in high-value, specialised isotope-separation equipment while importing lower-value components.

Isotopic separation machinery: a volatile and shrinking export niche

Exports of isotopic separation machinery (CN 840120) collapsed from €62 million (2015) to just €1.9 million (2018), before partially recovering to €56 million by 2025. The physical volume tells a similar story: from 1,656 tonnes in 2015 to a nadir of 40 tonnes in 2018, recovering to 845 tonnes in 2025. This volatility likely reflects the lumpy, project-based nature of centrifuge and isotope-separation equipment contracts. The 2018 trough may coincide with the completion of major enrichment-facility orders and a subsequent gap before new projects materialised. Despite the recovery, this segment's share of total exports fell from 20% to 7%, as fuel-cartridge trade grew much faster.

Price shocks concentrated in major bilateral relationships

The volatility analysis detected three significant price shocks during the period:

The most extreme event was a near-fivefold spike in EU export prices to the United States in 2018, possibly reflecting a one-off high-value contract or a shift in product mix toward premium fuel assemblies. The China-related shock in 2019 is also noteworthy given that it affected over a quarter of export value, potentially linked to specialised equipment deliveries for China's expanding reactor fleet. Among import partners, Russia showed moderate volatility (coefficient of variation: 0.65), while Japan (CV: 1.43) and several smaller partners exhibited much higher variability — consistent with the sporadic, project-driven nature of this sector.

Conclusion

Over the 2015–2025 decade, the EU's trade in nuclear reactors, fuel elements, and related machinery underwent a fundamental structural transformation. The Union moved from a €247 million trade deficit to a modest surplus, underpinned by a near-quadrupling of domestic production value. The market became more concentrated in fuel cartridges, which now account for the vast majority of both imports and exports, while the formerly significant isotopic-separation niche experienced sharp volatility. Geopolitically, Russia retained its position as the dominant import supplier but with a gradually declining share, and EU exports diversified markedly toward China, Ukraine, South Africa, and the United Kingdom. Rising unit values — particularly on the export side — point to an upward shift in the technological complexity of EU exports. However, the persistently high import concentration (HHI still near 5,000) and continued reliance on Russian fuel-cartridge supply highlight remaining vulnerabilities in a sector that is strategically central to Europe's energy security.